US9805661B2 - Pixel compensation circuit, display device and driving method - Google Patents

Pixel compensation circuit, display device and driving method Download PDF

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US9805661B2
US9805661B2 US14/913,330 US201514913330A US9805661B2 US 9805661 B2 US9805661 B2 US 9805661B2 US 201514913330 A US201514913330 A US 201514913330A US 9805661 B2 US9805661 B2 US 9805661B2
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voltage
transistor
turn
driving transistor
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US20170039954A1 (en
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Tuo Sun
Zhanjie MA
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BOE Technology Group Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3275—Details of drivers for data electrodes
    • G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
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    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • G09G3/3241—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror
    • G09G3/325—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror the data current flowing through the driving transistor during a setting phase, e.g. by using a switch for connecting the driving transistor to the data driver
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3266—Details of drivers for scan electrodes
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    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0421—Structural details of the set of electrodes
    • G09G2300/043—Compensation electrodes or other additional electrodes in matrix displays related to distortions or compensation signals, e.g. for modifying TFT threshold voltage in column driver
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    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0852—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor being a dynamic memory with more than one capacitor
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    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0861—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
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    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen

Definitions

  • the present invention relates to the display technical field, particularly to a pixel compensation circuit, display device and driving method.
  • the active matrix organic light emitting diode display (AMOIED) has been widely used due to the advantages such as wide viewing angle, good color contrast effect, fast response speed and self illumination.
  • AMOIED primarily employs low temperature poly-silicon as the driving layer to enable its pixel driving circuit. Compared to the general amorphous silicon technology, the low-temperature poly-silicon thin film transistor is characterized by higher mobility and better stability, which is more suitable for AMOLED display.
  • the low-temperature poly-silicon backplate inevitably leads to difference in threshold voltages of the very close transistors. This would cause the display brightness of different pixels to be different when they receive the same data signal, thereby resulting in non-uniform display of the display panel.
  • the embodiments of the present invention provide a pixel compensation circuit, display device and driving method for solving the problem of non-uniform display of the display panel resulting from the difference in threshold voltages of the transistors on the low-temperature poly-silicon backplate.
  • the pixel compensation circuit comprises a driving signal generation module, a data line loading module, a voltage loading module, an organic light-emitting diode and a driving transistor.
  • the data signal loading module is capable of receiving a data signal and a scanning signal and is used for loading the data signal to a gate of the driving transistor when the scanning signal is a turn-on signal.
  • the voltage loading module is at least capable of receiving a first voltage signal and a second luminescent signal and is used for loading the first voltage signal to a source of the driving transistor when a first luminescent signal and the scanning signal are both turn-on signals, wherein a voltage of the first voltage signal is higher than a voltage of the data signal, and a voltage of the first voltage signal is higher than a voltage of a second voltage signal which is received by the cathode of the organic light-emitting diode.
  • the driving signal generation module is capable of receiving the first luminescent signal and a third voltage signal and is used for storing a signal of the source of the driving transistor, a signal of the gate of the driving transistor and the third voltage signal; and storing the data signal when the first luminescent signal and the scanning signal are both turn-on signals; and generating the signal of the source of the driving transistor according to the signal of the gate of the driving transistor when the first luminescent signal is a turn-off signal, the scanning signal is a turn-on signal and the voltage loading module stops loading a signal to the source of the driving transistor; and receiving the voltage signal loaded by the voltage loading module to the source of the driving transistor when the scanning signal and the first luminescent signal are both turn-off signals, and the second luminescent signal is a turn-on signal; and generating a driving signal according to the signal of the source of the driving transistor and the signal of the gate of the driving transistor when the scanning signal is a turn-off signal, and the first luminescent signal and the second luminescent signal are both turn-on
  • the display device provided by the embodiments of the present invention comprises the pixel compensation circuit provided by the embodiments of the present invention.
  • the driving method provided by the embodiments of the present invention is applied in the pixel compensation circuit provided by the embodiments of the present invention.
  • the method comprises: the data signal loading module loading the data signal to a gate of the driving transistor when the scanning signal is a turn-on signal; the voltage loading module loading the first voltage signal to a source of the driving transistor when the first luminescent signal and the scanning signal are both turn-on signals, wherein a voltage of the first voltage signal is higher than a voltage of the data signal, and a voltage of the first voltage signal is higher than a voltage of a second voltage signal which is received by the cathode of the organic light-emitting diode; the driving signal generation module storing a signal of the source of the driving transistor, a signal of the gate of the driving transistor and the third voltage signal; and storing the data signal when the first luminescent signal and the scanning signal are both turn-on signals; and generating the signal of the source of the driving transistor according to the signal of the gate of the driving transistor when the first luminescent signal is a
  • the driving signal generation module is capable of generating a signal of the source of the driving transistor according to the signal of the gate of the driving transistor when the first luminescent signal is a turn-off signal, the scanning signal is a turn-on signal and the voltage loading module stops loading a signal to the source of the driving transistor, the signal of the source of the driving transistor being correlated with the threshold voltage, and generating a driving signal according to the signal of the source of the driving transistor and the signal of the gate of the driving transistor when the scanning signal is a turn-off signal, and the first luminescent signal and the second luminescent signal are both turn-on signals; the driving transistor generates a drain current according to the driving signal to drive the organic light-emitting diode to emit light. This can reduce impact of the difference in threshold voltages of the driving transistor on the drain current of the driving transistor to thereby reduce non-uniformity of display of the display
  • FIG. 1 is a first structural schematic diagram of a pixel compensation circuit provided by the embodiments of the present invention.
  • FIG. 2 is a second structural schematic diagram of a pixel compensation circuit provided by the embodiments of the present invention.
  • FIG. 3 is a third structural schematic diagram of a pixel compensation circuit provided by the embodiments of the present invention.
  • FIG. 4 is a fourth structural schematic diagram of a pixel compensation circuit provided by the embodiments of the present invention.
  • FIG. 5 is a working time sequential diagram of the pixel compensation circuit shown in FIG. 3 .
  • FIG. 6 is a working time sequential diagram of the pixel compensation circuit shown in FIG. 4 .
  • the transistor in the pixel compensation circuit may be a p-type transistor and may also be an n-type transistor.
  • the turn-on signal is a low level signal
  • the turn-off signal is a high level signal.
  • the transistor in the pixel compensation circuit is an n-type transistor
  • the turn-on signal is a high level signal
  • the turn-off signal is a low level signal.
  • the circuit logic of the pixel compensation circuit is the same.
  • the transistor in the pixel compensation circuit is a p-type transistor as an example.
  • the operational principle of the pixel compensation circuit consisting of the n-type transistor is similar to that of the pixel compensation circuit consisting of the p-type transistor, unnecessary details of which are not given here.
  • a first pole of the transistor mentioned in the embodiments of the present invention may be a source (or drain) of the transistor, and a second pole of the transistor may be a drain (or source) of the transistor. If the source of the transistor is the first pole, the drain of transistor is the second pole. If the drain of the transistor is the first pole, the source of the transistor is the second pole.
  • the embodiments of the present invention provide a pixel compensation circuit.
  • the pixel compensation circuit as shown comprises a data signal loading module 11 , a voltage loading module 12 , a driving signal generation module 13 , an organic light-emitting diode D and a driving transistor Td.
  • the data signal loading module 11 is configured to be inputted with a scanning signal SS and a data signal DS, and connected to a gate of the driving transistor Td.
  • the data signal loading module 11 is used for loading the data signal DS to the gate of the driving transistor Td when the scanning signal SS is a turn-on signal.
  • the voltage loading module 12 is configured to be inputted with a second luminescent signal Em 2 and a first voltage signal V 1 , and connected to a source of the driving transistor Td.
  • the voltage loading module 12 is used for loading the first voltage signal V 1 inputted to the voltage loading module 12 to the source of the driving transistor Td when a first luminescent signal Em 1 inputted to the driving signal generation module 13 and the scanning signal SS inputted to the data signal loading module 11 are both turn-on signals, wherein the voltage of the first voltage signal V 1 is higher than the voltage of the data signal DS inputted to the data signal loading module 11 , and the voltage of the first voltage signal V 1 is higher than the voltage of the second voltage signal V 2 received by the cathode of the organic light-emitting diode D; and loading the first voltage signal V 1 inputted to the voltage loading module to the source of the driving transistor Td when the second luminescent signal Em 2 is a turn-on signal, and the first luminescent signal EM 1 and the
  • the voltage loading module 12 is configured to be inputted with the second luminescent signal Em 2 , a reset signal RS, the first voltage signal V 1 and a third voltage signal V 3 , and connected to the source of the driving transistor Td.
  • the voltage loading module 12 is used for loading the first voltage signal V 1 inputted to the voltage loading module 12 to the source of the driving transistor Td when the first luminescent signal Em 1 inputted to the driving signal generation module 13 and the scanning signal SS inputted to the data signal loading module 11 are both turn-on signals and the second luminescent signal Em 2 is a turn-off signal, wherein the voltage of the first voltage signal V 1 is higher than the voltage of the data signal DS inputted to the data signal loading module 11 , and the voltage of the first voltage signal V 1 is higher than the voltage of the second voltage signal V 2 received by the cathode of the organic light-emitting diode D; and loading the third voltage signal V 3 to the source of the driving transistor Td when the second luminescent signal Em 2 is a turn-on signal, and the scanning signal SS and the reset signal RS are both turn-off signals, wherein the first voltage signal V 1 is different from the third voltage signal V 3 , and the reset signal RS is also maintained as a turn-on signal when the first
  • the driving signal generation module 13 is configured to be inputted with the first luminescent signal Em 1 and the third voltage signal V 3 , and connected to the gate and the source of the driving transistor Td.
  • the driving signal generation module 13 is used for storing a signal of the source of the driving transistor Td, a signal of the gate of the driving transistor Td and the third voltage signal V 3 ; and storing the data signal DS when the first luminescent signal Em 1 and the scanning signal SS are both turn-on signals; and generating the signal of the source of the driving transistor Td according to the signal of the gate of the driving transistor Td when the first luminescent signal Em 1 is a turn-off signal, the scanning signal SS is a turn-on signal and the voltage loading module 12 stops loading a signal to the source of the driving transistor Td, wherein, it is well-known to those skilled in the art that the signal of the source of the driving transistor Td is correlated with a threshold voltage Vth of the driving transistor Td; and
  • the driving signal generation module 13 comprises a first capacitance C 1 , a second capacitance C 2 and a fourth transistor T 4 .
  • the first capacitance C 1 is connected between the source of the driving transistor Td and the gate of the driving transistor Td.
  • a gate of the fourth transistor T 4 receives the first luminescent signal Em 1
  • a first pole of the fourth transistor T 4 is connected to the gate of the driving transistor Td
  • a second pole of the fourth transistor T 4 receives the third voltage signal V 3 via the second capacitance C 2 .
  • the first voltage signal V 1 is identical with the third voltage signal V 3 , both of which are shown in FIG.
  • the voltage loading module comprises a first transistor T 1 .
  • a gate of the first transistor T 1 receives the second luminescent signal Em 2 , a first pole of the first transistor T 1 receives the first voltage signal V 1 , and a second pole of the first transistor T 1 is connected to the source of the driving transistor Td.
  • the data signal loading module 11 comprises a fifth transistor T 5 .
  • a gate of the fifth transistor T 5 receives the scanning signal SS, a first pole of the fifth transistor T 5 receives the data signal DS, and a second pole of the fifth transistor T 5 is connected to the gate of the driving transistor Td.
  • the driving signal generation module 13 like the one shown in FIG. 3 , comprises a first capacitance C 1 , a second capacitance C 2 and a fourth transistor T 4 .
  • the first capacitance C 1 is connected between the source of the driving transistor Td and the gate of the driving transistor Td.
  • a gate of the fourth transistor T 4 receives the first luminescent signal Em 1
  • a first pole of the fourth transistor T 4 is connected to the gate of the driving transistor Td
  • a second pole of the fourth transistor T 4 receives the third voltage signal V 3 via the second capacitance C 2 .
  • the voltage loading module 12 comprises a second transistor T 2 and a third transistor T 3 .
  • a gate of the second transistor T 2 receives the second luminescent signal Em 2
  • a first pole of the second transistor T 2 receives the third voltage signal V 3
  • a second pole of the second transistor T 2 is connected to the source of the driving transistor Td.
  • a gate of the third transistor T 3 receives the reset signal RS
  • a first pole of the third transistor T 3 receives the first voltage signal V 1
  • a second pole of the third transistor T 3 is connected to the source of the driving transistor Td.
  • the first voltage signal V 1 is different from the third voltage signal V 3 .
  • the first voltage signal V 1 is a reference signal Ref
  • the third voltage signal V 3 is a signal VDD.
  • the data signal loading module 11 like the one shown in FIG. 3 , a fifth transistor T 5 .
  • a gate of the fifth transistor T 5 receives the scanning signal SS
  • a first pole of the fifth transistor T 5 receives the data signal DS
  • a second pole of the fifth transistor T 5 is connected to the gate of the driving transistor Td.
  • FIG. 5 shows a working time sequence of the pixel compensation circuit shown in FIG. 3 .
  • the turn-on signal is a low level signal and the turn-off signal is a high level signal.
  • the signal of the gate of the driving transistor Td i.e., signal of point B
  • the driving signal generation module 13 would store the data signal DS
  • the signal of the source of the driving transistor Td i.e., signal of point A
  • the scanning signal SS is a turn-on signal and the voltage loading module 12 stops loading a signal to the source of the driving transistor Td, i.e., in a time period ii, since the voltage of the source of the driving transistor Td after just entering the time period ii is the voltage Vdd of the signal VDD, which is higher than the voltage Vdata of the data signal DS and higher than the voltage of the second voltage signal V 2 received by the cathode of the organic light-emitting diode D, the driving transistor Td and the organic light-emitting diode D constitute a discharge channel until the voltage of the source of the driving transistor Td, i.e., voltage of point A, decreases to Vdata+Vth.
  • the scanning signal SS is a turn-on signal
  • the voltage of the gate of the driving transistor Td i.e., voltage of point B
  • the second luminescent signal Em 2 is a turn-on signal, i.e., in a time period iii, since the signal VDD loaded by the voltage loading module 12 to the source of the driving transistor Td is received, the voltage of point A changes from Vdata+Vth to Vdd.
  • the driving signal generation module 13 is used for storing the capacitances of the signal of the source of the driving transistor Td (i.e., signal of point A) and the signal of the gate of the driving transistor Td (i.e., signal of point B), i.e., coupling effect of the first capacitance C 1 , the voltage of point B changes from Vdata to Vdd-Vth.
  • the scanning signal SS is a turn-off signal
  • the first luminescent signal Em 1 and the second luminescent signal Em 2 are both turn-on signals, i.e., in a time period iv, since the fourth transistor T 4 is conducting, the plates of the first capacitance C 1 and the second capacitance C 2 are connected and charges would flow therebetween.
  • the electric potential Vb of point B is:
  • the signal of point B is namely the driving signal.
  • the driving transistor Td would generate a drain current Id according to the signal of point A, i.e., signal VDD, and the signal of point B, so as to drive the organic light-emitting diode D to emit light, wherein Id is:
  • Id K ⁇ ( C ⁇ ⁇ 2 C ⁇ ⁇ 1 + C ⁇ ⁇ 2 ) 2 ⁇ ( Vdd + Vth - Vdata ) ,
  • K is a constant correlated with the structural parameters of the driving transistor. Since Vdd and Vth are both relatively determined, it is required to adjust the value of Vdata in order to reach the desired drain current. The same current interval corresponds to an increased Vdata range. Meanwhile, due to the increase in the Vdata range, the impact of the respective fluctuation in Vth and Vdd on the final drain current Id would correspondingly become smaller, thereby realizing the effect of partially compensating Vdd and Vth, i.e., realizing the effect of partially compensating the threshold voltage deviation.
  • the embodiments of the present invention provide another pixel compensation circuit.
  • the pixel compensation circuit shown in FIG. 4 is to load a reference signal Ref when the first luminescent signal Em 1 and the scanning signal SS are both turn-on signals.
  • the voltage Vref of the reference signal Ref may be set to be high enough to thereby ensure that when the first luminescent signal Em 1 is a turn-off signal, the scanning signal SS is a turn-on signal and the voltage loading module 12 stops loading a signal to the source of the driving transistor Td, the driving transistor Td can be conducting to constitute a discharge channel to read the threshold voltage of the driving transistor.
  • FIG. 6 shows a working time sequence of the pixel compensation circuit shown in FIG. 4 .
  • the turn-on signal is a low level signal and the turn-off signal is a high level signal.
  • the reset signal RS is a turn-on signal
  • the second luminescent signal Em 2 is a turn-off signal
  • the signal of the gate of the driving transistor Td i.e., signal of point B
  • the driving signal generation module would store the data signal DS
  • the signal of the source of the driving transistor Td i.e., signal of point A
  • the scanning signal SS is a turn-on signal and the voltage loading module 12 stops loading a signal to the source of the driving transistor Td, i.e., in a time period ii, since the voltage of the signal of the source of the driving transistor Td, i.e.
  • the driving transistor Td and the organic light-emitting diode D constitute a discharge channel until the voltage of the source of the driving transistor Td, i.e., voltage of point A, decreases to Vdata+Vth. Since the scanning signal SS is a turn-on signal, the voltage of the gate of the driving transistor Td, i.e., voltage of point B, is still Vdata.
  • the second luminescent signal Em 2 is a turn-on signal
  • RS is a turn-off signal, i.e., in a time period iii, since the signal VDD loaded by the voltage loading module 12 to the source of the driving transistor Td is received, the voltage of point A changes from Vdata+Vth to Vdd.
  • the driving signal generation module 13 is used for storing the capacitances of the signal of the source of the driving transistor Td (i.e., signal of point A) and the signal of the gate of the driving transistor Td (i.e., signal of point B), i.e., coupling effect of the first capacitance C 1 , the voltage of point B changes from Vdata to Vdd-Vth.
  • the scanning signal SS is a turn-off signal
  • the first luminescent signal Em 1 and the second luminescent signal Em 2 are both turn-on signals, i.e., in a time period iv, since the fourth transistor T 4 is conducting, the plates of the first capacitance C 1 and the second capacitance C 2 are connected and charges would flow therebetween.
  • the electric potential Vb of point B is:
  • the signal of point B is namely the driving signal.
  • the driving transistor Td would generate a drain current Id according to the signal of point A, i.e., signal VDD, and the signal of point B, so as to drive the organic light-emitting diode D to emit light, wherein Id is:
  • Id K ⁇ ( C ⁇ ⁇ 2 C ⁇ ⁇ 1 + C ⁇ ⁇ 2 ) 2 ⁇ ( Vdd + Vth - Vdata ) ,
  • K is a constant correlated with the structural parameters of the driving transistor. Since Vdd and Vth are both relatively determined, it is required to adjust the value of Vdata in order to reach the desired drain current. The same current interval corresponds to an increased Vdata range. Meanwhile, due to the increase in the Vdata range, the impact of the respective fluctuation in Vth and Vdd on the final drain current Id would correspondingly become smaller, thereby realizing the effect of partially compensating Vdd and Vth, i.e., realizing the effect of partially compensating the threshold voltage deviation.
  • the data signal of each frame may be different (Vdata is different), therefore, in FIGS. 5 and 6 the stabilized voltage value of point B in the fourth time sequence of the previous frame may be different from the stabilized voltage value of point B in the fourth time sequence of the current frame. According to the working time sequence shown in FIG. 5 or FIG. 6 , display of the display signal is effected.
  • the embodiments of the present invention provide a display device comprising the pixel compensation circuit provided by any embodiment of the present invention.
  • the embodiments of the present invention provide a driving method which is applied in the pixel compensation circuit provided by the embodiments of the present invention.
  • the method comprises: the data signal loading module loading the data signal to a gate of the driving transistor when the scanning signal is a turn-on signal; the voltage loading module loading the first voltage signal to a source of the driving transistor when the first luminescent signal and the scanning signal are both turn-on signals, wherein a voltage of the first voltage signal is higher than a voltage of the data signal, and a voltage of the first voltage signal is higher than a voltage of a second voltage signal which is received by the cathode of the organic light-emitting diode; the driving signal generation module storing a signal of the source of the driving transistor, a signal of the gate of the driving transistor and the third voltage signal; and storing the data signal when the first luminescent signal and the scanning signal are both turn-on signals; and generating the signal of the source of the driving transistor according to the signal of the gate of the driving transistor when the first luminescent signal is
  • the first voltage signal is identical with the third voltage signal.
  • the second luminescent signal is a turn-on signal; the voltage loading module thereby loads the first voltage signal to the gate of the driving transistor.
  • the first voltage signal is different from the third voltage signal.
  • the voltage loading module further receives the reset signal and the third voltage signal.
  • the reset signal is a turn-on signal
  • the voltage loading module thereby loads the first voltage signal to the gate of the driving transistor; and when the scanning signal and the first luminescent signal are both turn-off signals and the second luminescent signal is a turn-on signal, the voltage loading module loads the third voltage signal to the gate of the driving transistor.
  • FIG. 1 is just a schematic diagram of one preferred embodiment.
  • a module or flow in the figure is not necessarily essential for implementing the present invention.
  • modules in the device of the embodiment can be distributed in the device of the embodiment according to the description of the embodiment, and can also be correspondingly changed and located in one or more devices different from the present embodiment.
  • the modules in the above embodiment can be integrated into one module and can also be further split into a plurality of sub-modules.
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CN108062932B (zh) * 2017-12-20 2020-05-26 北京航空航天大学 一种有机薄膜晶体管构造的像素电路
CN111292681A (zh) * 2018-12-07 2020-06-16 陕西坤同半导体科技有限公司 有源矩阵有机发光显示器的像素电路结构及其显示器
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